60 synonyms for heavily such as awfully, a great deal, and absolutely. Heavily is an adverb, and its antonyms are easily, quickly, narrowly, moderately, and lightly.
A great deal, absolutely, awfully, awkwardly, bigly, closely, clumsily, compactly, completely, conclusively, copiously, decisively, deeply, dejectedly, deliberately, densely, dully, enormously, ever so, exceedingly, excessively, extremely, gloomily, greatly, immoderately, inordinately, intemperately, jolly, laboriously, majorly, overmuch, painfully, ponderously, profoundly, roundly, seriously, slowly, sluggishly, soundly, steadily, stiffly, terribly, thickly, thoroughly, to a great extent, to excess, to too great an extent, too much, totally, tremendously, utterly, very, very much, with difficulty, with heavy steps, with leaden steps, without control, without restraint, and woodenly.